Hi Eric,
Perhaps you can provide a link to the study done that demonstrates that,
"AGMs have an advantage over FLA in that they do not suffer as much from Peukert's Effect"?
Were these studies done with AGM and FLA side by side or merely a tests done with AGM alone as opposed to published data of FLA?
I am highly suspect of any studies done with AGM in an air conditioned test chamber. :)
My understanding of the 1897 Peukert's Law is simply that lead-acid battery capacity is inversely proportional to load. Simply stated it is that the Amp Hour rating of a battery decreases with increasing load.
Given that AGM and FLA have similar plate and electrolyte chemistries, I find it puzzling that AGM would outperform FLA allowing for 50% increase in range?
Don
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Dave,
>
> Don has some strong opinions about batteries, but I know of a number of EVs using AGM batteries (not Optima) that have hundreds of cycles at high amperage loads and deep discharges without failures or maintenance beyond charging. AGMs have an advantage over FLA in that they do not suffer as much from Peukert's Effect, allowing for a smaller rated battery bank (in Ah) to deliver that same amount of energy at rates between 1/3 to 1/2 the Ah rating (50A-75A from a 150Ah battery), or for the same size AGM battery bank to deliver close to 50% greater range compared to FLA batteries at the same high amp loads.
>
> But everyone is entitled to their own opinion. Personally, my money went towards Lithium batteries for the conversion of my 30' ketch. My second choice would be AGMs.
>
> Fair winds,
> Eric
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, "desulfator" <desulfator@> wrote:
> >
> > Hi David,
> >
> > Anything would be preferable to AGM.
> >
> > Most of the battery savvy folks use the large telecom batteries that have a clear case and space between the lead plates and cell wall. They have the additional advantage of an SG smapling port that can be used to bubble the cells with low pressure air. This will remix the electrolyte in the event it becomes stratified due to non-use.
> >
> > Another advantage to these large 2 volt cells are the reduced self discharge rates. It seems over time multi-cell batteries wind up with partially conductive cell walls that allow increased self discharge amperage.
> >
> > The only thing AGM batteries are good for is providing power in a Zero-G environment such as space exploration.
> >
> > Some applications trade longevity for convenience such as packaged units like emergency lighting or UPS. But the owners have to be prepared for battery replacement every few years.
> >
> > Lead-Acid flooded cell batteries will last 20-30 years if they are maintained properly and not exposed to high heat conditions.
> >
> > Don
> >
> >
> >
> > --- In electricboats@yahoogroups.com, "davidhughes_casaba" <davidhughes_casaba@> wrote:
> > >
> > > I remember the sparrow and never knew what happened. Interesting.
> > >
> > > I must admit, this is the first I have heard bad things about AGMs. What do you recommend flooded wet lead acids like Trojan or some other technology?
> > >
> > > Thanks
> > > Dave
> > >
>
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